Move all flags to CompilerOptions (first step to stop passing the compiler to

pkg/compiler/lib/src/world.dart

Index: pkg/compiler/lib/src/world.dart
diff --git a/pkg/compiler/lib/src/world.dart b/pkg/compiler/lib/src/world.dart
index 3e382e179ce01220de9f6b5b5485ea0db65624b8..a7dbad01fdc8df872d8955498b9273663d859fae 100644
--- a/pkg/compiler/lib/src/world.dart
+++ b/pkg/compiler/lib/src/world.dart
@@ -653,7 +653,8 @@ class World implements ClassWorld {
     /// properties of the [ClassHierarchyNode] for [cls].
 
     void addSubtypes(ClassElement cls) {
-      if (compiler.hasIncrementalSupport && !alreadyPopulated.add(cls)) {
+      if (compiler.options.hasIncrementalSupport &&
+          !alreadyPopulated.add(cls)) {
         return;
       }
       assert(cls.isDeclaration);
@@ -841,5 +842,5 @@ class World implements ClassWorld {
     return functionsThatMightBePassedToApply.contains(element);
   }
 
-  bool get hasClosedWorldAssumption => !compiler.hasIncrementalSupport;
+  bool get hasClosedWorldAssumption => !compiler.options.hasIncrementalSupport;
 }